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    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>Document</title>
    <style>
        p {
            width: 200px;
        }
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    <!-- 格式化上下文是怎样的  FC:BFC IFC  -->
    <p>
        It can get <strong> very complicated</strong> once you start looking into it.
    </p>
    1. html创建 body参与共建 第一个BFC
    2. p block container(块级容器) 对内参数一个IFC
    由于一行无法完全显示, 所以产生3个线盒(line-box)
    line-height
    3. It can get 匿名的inline box
    4. very complicated strong标签产生的inline box
    5. once you
    6. start looking into it 匿名的inline box
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